Judging Stock Concept Tags by First and Last Mention Dates to Separate Old Labels from New Narratives

A stock's top-ranked concept tags can reflect a long-standing label that has simply accumulated mentions, while a genuinely new narrative may rank far lower with only a few recent mentions. The article proposes comparing each concept's first and last mention timestamps, converted into ages relative to the request time, to score how fresh a tag is. It warns that a short lookback window makes older labels appear new, so freshness should be confirmed by pulling both a 90-day and a 365-day window. It also notes that a low default row limit can cut off emerging concepts, recommending a larger limit for this kind of analysis. The approach uses Lava's stock-to-concept heat endpoint, with each call costing a small fee, and the resulting labels are descriptive rather than definitive.